The Halong Bay day cruise experience during your Vietnam tours. With boat trips, it's simple to travel in 2.5 hours from Hanoi to Halong Bay and back the same day.
Website:

Halong Bay Day Trip: How to have a memorable Halong ...

Map:

Paradise Vietnam · khách Quốc tế, Cổng 3, 4 Cảng tàu...

Địa chỉ: Unit 903, 9th Floor, Gelex Tower, no. 52 Le Dai Hanh St., Hai Ba Trung Dist., Hanoi, Vietnam Hanoi, Viet Nam